I first had an initial interview with HR. She was very kind and explained to me everything I should know. I asked many questions and she answered them patiently. Then in the second round of the interview, I talked to one of the superiors of the job position. He was also very kind, and asked me multiple detailed questions about my research, why I am interested in this position, what exactly are the points that made me apply to this position, what I expect from my peers and superiors while working, How I chose my PhD project etc.